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18.9
General working instructions
Do not clamp workpieces that exceed the permissible clamping range of the
workpiece holders, machine chucks, etc. The clamping force of a machine chuck is
too low when the clamping range is exceeded. The clamping jaws can become loose.
Regularly check the closed condition of the clamping bolts.
The workpieces must be clamped securely and firmly on the machine before machining. The
clamping force should be dimensioned in such a way that the workpiece can be securely gripped,
but no damage or deformation of the workpiece occurs.
Clamping the workpiece
1. Disconnect the machine from the mains.
2. Place a stable board or chuck cradle under the spindle to protect the precision-ground
surfaces.
3. Insert the chuck key into a scroll groove and turn it counterclockwise to open the jaws
until the workpiece lies flat on the clamping surface or evenly on the jaw steps or fits into
the chuck hole and through the spindle hole.
4. Close the jaws until they make light contact with the workpiece.
5. Turn the chuck by hand to ensure that the workpiece is held evenly by all three jaws and
centred on the chuck.
If the workpiece is not centred, release the jaws and realign the workpiece. Retighten the jaws
and repeat step 5. When the workpiece is centred, fully tighten the jaws.
18.9.1 3-jaw chuck
The 3-jaw chuck supplied with your machine is a scroll chuck, i.e. all three jaws move uniformly
when the chuck key is turned. This jaw configuration is used to hold concentric workpieces that
are centred with the same pressure from all three jaws. A set of reversible top jaws is also
included to allow additional workpiece configurations.
HOLZMANN MASCHINEN GmbH
WARNING
CAUTION
Both sets of jaws can accommodate a workpiece on both
the inside and outside - see illustration on the left.
Regardless of how you configure the jaws, make sure the
workpiece is firmly clamped in the jaw chuck.
Ø D
80 mm
www.holzmann-maschinen.at
A – A1
B – B1
2 – 22 mm
25 – 70 mm
OPERATION
C – C1
22 – 63 mm
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